Bistable permanent magnet mechanism with stroke and force characteristic automatic compensation function

Abstract

The application discloses a bistable permanent magnetic mechanism with automatic compensation function of stroke and mechanical characteristics, comprising a magnetic conducting cylinder, a closing position magnetic conducting plate, an opening position magnetic conducting plate, a closing coil winding, an opening coil winding, a permanent magnet, a magnetic conducting ring, a moving iron core and an operating rod, when the bistable permanent magnetic mechanism is at the closing position, a stroke compensation air gap capable of compensating the contact burning degree of the vacuum circuit breaker is formed between the first side of the moving iron core and the closing position magnetic conducting plate, and a compensation spring is arranged on the first side of the moving iron core, the compensation spring can be deformed with the change of the stroke compensation air gap, so as to offset the permanent magnetic attraction change of the permanent magnet caused by the change of the stroke compensation air gap. The bistable permanent magnetic mechanism has the automatic compensation function, can ensure that the overall action characteristic curve of the vacuum circuit breaker in the whole life period does not change basically, and makes the overall characteristics of the vacuum circuit breaker stable and reliable.

Description

Technical Field

[0001] This invention relates to the field of bistable permanent magnet mechanism technology, and in particular to a bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics. Background Technology

[0002] A bistable permanent magnet mechanism is a type of mechanism used in vacuum switches (or vacuum circuit breakers) to drive the moving contact of the vacuum interrupter to perform opening and closing movements. The permanent magnet mechanism operates in three states: closing, opening, and holding. In the holding state, the permanent magnet provides magnetic force, keeping the moving iron core stably in the open or closed position. During opening or closing operations, sufficient current is supplied to the corresponding opening or closing coil to provide an electromagnetic force that overcomes the holding force of the permanent magnet, driving the moving iron core and the operating lever to move, thereby causing the moving contact to perform the opening or closing movement.

[0003] As is well known, during the lifespan of a vacuum switch, the moving contact will burn out due to repeated opening and closing operations, and the contact stroke will change as the burnout accumulates. To address this technical drawback, a separate opening spring assembly for overtravel compensation is added to the traditional bistable permanent magnet mechanism. However, the use of this opening spring assembly increases the size, complexity, and cost of the permanent magnet mechanism. Furthermore, the compensation amount of this opening spring assembly gradually decreases as the contact burnout increases, resulting in a deterioration in the vacuum switch's motion characteristics and a gradual decline in electrical performance such as circuit resistance and making capability.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] To overcome the above-mentioned defects, the present invention provides a bistable permanent magnet mechanism. On the one hand, it has an automatic compensation function, which can ensure that the overall operating characteristic curve of the vacuum circuit breaker remains basically unchanged throughout its entire lifespan, making the overall characteristics of the vacuum circuit breaker stable and reliable. On the other hand, its improved structure is simple, compact, low in cost, and easy to manufacture and implement.

[0006] The technical solution adopted by this invention to solve its technical problem is: a bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics, comprising a magnetic cylinder, a closing magnetic plate, an opening magnetic plate, a closing coil winding, an opening coil winding, a permanent magnet, a magnetic ring, a moving iron core, and an operating rod. The magnetic cylinder is a hollow cylindrical structure. The closing magnetic plate and the opening magnetic plate are respectively fixedly connected to the two axial ends of the magnetic cylinder. The closing coil winding, the permanent magnet, and the opening coil winding are sequentially arranged in the magnetic cylinder along its axial direction. Simultaneously, the closing coil winding is close to the closing magnetic plate, and the opening coil winding is also close to the opening magnetic plate. The magnetic ring is fixed to the inner side of the permanent magnet, and the magnetic ring is also connected to the closing magnetic plate. The coil winding, the trip coil winding, the closing magnetic plate, and the trip magnetic plate together form a movable cavity. The moving iron core is movably housed within the movable cavity, and the operating rod is securely inserted into the moving iron core. Simultaneously, both ends of the operating rod extend movably outside the closing magnetic plate and the trip magnetic plate, respectively. When the bistable permanent magnet mechanism is in the closed position, a stroke compensation air gap is formed between the first side of the moving iron core facing the closing magnetic plate and the closing magnetic plate, capable of compensating for the burn-out degree of the vacuum circuit breaker contacts. A compensation spring is provided on the first side of the moving iron core, and the compensation spring can deform with the change of the stroke compensation air gap to counteract the change in permanent magnet attraction force caused by the change in the stroke compensation air gap.

[0007] As a further improvement of the present invention, the stroke compensation air gap is inversely proportional to the degree of contact burn-out of the vacuum circuit breaker.

[0008] As a further improvement of the present invention, a mounting hole A is recessed on the first side of the moving iron core; one end of the compensation spring is fixed in the mounting hole A, and the other end of the compensation spring is a free end, which can elastically abut against the inner wall of the closed position magnetic plate under the drive of the moving iron core.

[0009] As a further improvement of the present invention, the moving iron core is a cylindrical structure made of electrical pure iron, and the mounting hole A is formed on the first axial side of the moving iron core facing the closed position magnetic guide plate and is arranged coaxially with the moving iron core;

[0010] One end of the compensation spring is fixed in the mounting hole A, and the compensation spring is also sleeved on the outside of the operating rod.

[0011] As a further improvement of the present invention, the magnetic cylinder has a hollow cylindrical body and an integral mounting ring protruding from the inner wall of the cylindrical body, the mounting ring being arranged with the cylindrical body on the same central axis.

[0012] The closing magnetic guide plate has a flat plate body A and a ring body integrally disposed on the inner wall of the plate body A;

[0013] The opening position magnetic guide plate has a plate body B in the shape of a flat plate and a stop ring platform B in the shape of a ring integrally disposed on the inner wall of the plate body B;

[0014] The plate body A and the plate body B are respectively fixedly connected to the two ends of the cylinder body. The stop ring platform A and the stop ring platform B extend into the cylinder body and are arranged on the same central axis as the cylinder body. In addition, the inner and outer diameters of the stop ring platform A and the stop ring platform B are equal.

[0015] As a further improvement of the present invention, the closing coil winding has a skeleton A and a copper enameled coil wound on the skeleton A. The closing coil winding is disposed between the first side of the mounting ring platform facing the closing position magnetic guide plate and the inner wall of the plate body A. The outer wall of the stop ring platform A also stops and limits the closing coil winding.

[0016] The trip coil winding has a skeleton B and a copper enameled coil wound on the skeleton B. The trip coil winding is located between the second side of the mounting ring platform facing the trip position magnetic guide plate and the inner wall of the plate body B. The outer wall of the stop ring platform B also stops and limits the trip coil winding.

[0017] The permanent magnets are a plurality of units, which are fixedly arranged in a ring at equal intervals on the inner wall of the mounting ring platform facing away from the main body of the cylinder; the magnetic guide ring is fixedly connected to the inner wall of the plurality of permanent magnets facing away from the mounting ring platform.

[0018] As a further improvement of the present invention, both the skeleton A and the skeleton B adopt an I-beam wheel structure, and the stop ring platform A and the stop ring platform B respectively extend into the central inner hole of the skeleton A and the skeleton B;

[0019] In addition, the inner walls of the central inner holes of the skeleton A and the skeleton B are respectively flush with the inner wall of the magnetic ring.

[0020] As a further improvement of the present invention, the moving iron core is a cylindrical structure made of electrical pure iron, with a mounting hole B in the center extending along its axial direction and penetrating both sides of its axial direction. The operating rod is securely inserted into the mounting hole B. In addition, both the plate body A and the plate body B are provided with through holes of the same size as the inner diameter of the stop ring platform A, so that the operating rod can move through.

[0021] The beneficial effects of this invention are as follows: 1) By providing a deformable compensation spring on the first side of the moving iron core facing the closed-position magnetic guide plate, when the bistable permanent magnet mechanism is in the closed position, the compensation spring can deform with the change of the stroke compensation air gap between the first side of the moving iron core and the closed-position magnetic guide plate, thereby offsetting the change in permanent magnet attraction force caused by the change in the stroke compensation air gap. This ensures that the overall operating characteristic curve of the vacuum circuit breaker remains basically unchanged throughout its entire lifespan, maintaining the inherent opening characteristics of the mechanism and making the overall characteristics of the vacuum circuit breaker stable and reliable. 2) Compared with the opening spring assembly in the traditional bistable permanent magnet mechanism, the compensation spring structure used in this invention is simple, compact, low-cost, and easy to manufacture and implement. In addition, through structural improvements, this invention can also omit the traditional opening spring assembly, greatly shortening the inherent opening time of the vacuum circuit breaker. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics described in the present invention in the open position.

[0023] Figure 2 This is a side view of the bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics described in the present invention in the open position.

[0024] Figure 3 for Figure 2 A schematic diagram of the AA cross-sectional structure of the bistable permanent magnet mechanism shown.

[0025] Figure 4 This is a schematic cross-sectional view of the bistable permanent magnet mechanism described in this invention in the closed position.

[0026] Figure 5 for Figure 3 An enlarged structural diagram of the magnetic cylinder, the closed-position magnetic plate, and the open-position magnetic plate assembled together;

[0027] Figure 6 for Figure 3 The enlarged structural diagram of the closing coil winding, opening coil winding, permanent magnet, magnetic ring, moving iron core, compensating spring and operating lever assembled together is shown in the figure.

[0028] Figure 7 This is a three-dimensional structural diagram of the closing coil winding, opening coil winding, permanent magnet, magnetic ring, moving iron core, compensating spring and operating rod assembled together according to the present invention.

[0029] Figure 8This is a three-dimensional structural diagram of the permanent magnet, magnetic ring, moving iron core, compensating spring, and operating rod assembled together according to the present invention.

[0030] Referring to the accompanying drawings, the following explanations are provided:

[0031] 1. Magnetic guide cylinder; 100. Cylinder body; 101. Mounting ring platform; 2. Closed position magnetic guide plate; 20. Plate body A; 21. Stop ring platform A; 3. Opening position magnetic guide plate; 30. Plate body B; 31. Stop ring platform B; 4. Closed coil winding; 5. Opening coil winding; 6. Permanent magnet; 7. Magnetic guide ring; 8. Moving iron core; 80. Mounting hole A; 9. Operating lever; 10. Compensating spring. Detailed Implementation

[0032] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Example 1:

[0034] Please see the appendix Figure 1 To be continued Figure 8 As shown, this invention provides a bistable permanent magnet mechanism with automatic compensation functions for stroke and mechanical characteristics, including a magnetic cylinder 1, a closed-position magnetic plate 2, an open-position magnetic plate 3, a closed coil winding 4, an open coil winding 5, a permanent magnet 6, a magnetic ring 7, a moving iron core 8, and an operating lever 9. The magnetic cylinder 1 is a hollow cylindrical structure. The closed-position magnetic plate 2 and the open-position magnetic plate 3 are respectively fixedly connected to the two axial ends of the magnetic cylinder 1. The closed-position magnetic plate 2, the open-position magnetic plate 3, and the closed-position magnetic plate 4 are sequentially arranged in the magnetic cylinder 1 along the axial direction. The closed-position magnetic plate 4 is also close to the operating lever 9. The closing magnetic plate 2 is mentioned above. The opening coil winding 5 is also close to the opening magnetic plate 3. The magnetic ring 7 is fixed on the inner side of the permanent magnet 6. The magnetic ring 7, together with the closing coil winding 4, the opening coil winding 5, the closing magnetic plate 2, and the opening magnetic plate 3, forms a movable cavity. The moving iron core 8 is movably built into the movable cavity. The operating rod 9 is firmly inserted into the moving iron core 8. At the same time, both ends of the operating rod 9 are respectively movably extended outside the closing magnetic plate 2 and the opening magnetic plate 3. In particular, when the bistable permanent magnet mechanism is in the closing position (see Appendix for details), Figure 4As shown, a stroke compensation air gap G is formed between the first side of the moving iron core 8 facing the closing magnetic guide plate 2 and the closing magnetic guide plate 2. This air gap G is designed to compensate for the burn-out of the contacts of the vacuum circuit breaker. A compensation spring 10 is provided on the first side of the moving iron core 8. This spring deforms with the change of the stroke compensation air gap G to counteract the change in the permanent magnet attraction force of the permanent magnet 6 caused by the change in the stroke compensation air gap G. This ensures that the overall operating characteristic curve of the vacuum circuit breaker remains essentially unchanged throughout its lifespan, maintaining the inherent opening characteristics of the mechanism and making the overall characteristics of the vacuum circuit breaker stable and reliable.

[0035] Furthermore, the travel compensation air gap G is inversely proportional to (or reversely changing) the degree of contact burn-out of the vacuum circuit breaker (conventionally referring to "burn-out thickness"); correspondingly, the compensation spring 10 can deform with the change of the travel compensation air gap G to counteract the change in permanent magnet attraction force of the permanent magnet 6 caused by the change of the travel compensation air gap G. In detail: throughout its entire lifespan, the travel change caused by contact burn-out in the vacuum circuit breaker is compensated by the travel compensation air gap G. That is, as the degree of contact burn-out gradually increases, the travel compensation air gap G gradually decreases, ensuring reliable contact and conduction of the contacts. However, as the travel compensation air gap G gradually decreases, the permanent magnet attraction force generated by the permanent magnet 6 gradually increases (the magnitude of the magnetic field is determined by the magnetic field line density). If this is not overcome, it will cause a change in the overall operating characteristic curve of the vacuum circuit breaker, specifically, a change in the characteristic curve during closing and opening operations. Therefore, this invention specifically addresses this issue. The invention specifically includes a compensation spring 10 on the first side of the moving iron core 8. This compensation spring 10 deforms as the stroke compensation air gap G decreases, generating a reaction force on the moving iron core 8. The direction of this reaction force points towards the open-position magnetic guide plate 3, thereby counteracting the increased permanent magnet attraction of the permanent magnet 6. This permanent magnet attraction generates a positive force on the moving iron core 8, pointing towards the closed-position magnetic guide plate 2. This ensures that the overall operating characteristic curve of the vacuum circuit breaker remains essentially unchanged throughout its lifespan, maintaining the inherent opening and closing characteristics of the mechanism and ensuring the overall stability and reliability of the vacuum circuit breaker. Furthermore, through structural improvements, this invention can omit the traditional opening spring assembly, significantly shortening the inherent opening time of the vacuum circuit breaker.

[0036] The following describes the installation method of the core improved component of this invention patent—the compensation spring 10.

[0037] Combined with appendix Figure 3 To be continued Figure 8The preferred installation method for the compensation spring 10 is as follows: the moving iron core 8 is a cylindrical structure made of electrical pure iron. A mounting hole A80 (specifically a circular countersunk hole structure) is recessed on the first axial side (i.e., the first side) of the moving iron core 8 facing the closing magnetic guide plate 2, and the mounting hole A80 is coaxial with the moving iron core 8. One end of the compensation spring 10 is fixed in the mounting hole A80, and the other end of the compensation spring 10 is a free end, which can elastically abut against the inner wall of the closing magnetic guide plate 2 under the action of the moving iron core 8 (referring to the specific structural description of the closing magnetic guide plate 2 below, the other end of the compensation spring 10 elastically abuts against the stop ring platform A21). Simultaneously, the compensation spring 10 is also sleeved on the outside of the operating rod 9. This installation method is simple, easy to implement, and does not occupy too much space, thus avoiding the disadvantages of increased size, structural complexity, and increased cost of the permanent magnet mechanism.

[0038] The following is a detailed description of the structure of other components in this invention patent.

[0039] See attached Figure 1 To be continued Figure 5 As shown, the magnetic cylinder 1 has a hollow cylindrical body 100 made of electrical pure iron and an integral mounting ring 101 protruding from the inner wall of the cylindrical body 100. The mounting ring 101 is arranged coaxially with the cylindrical body 100. The closed-position magnetic plate 2 has a flat plate body A20 and a ring-shaped stop ring A21 integrally formed on the inner wall of the plate body A20. The side wall of the plate body A20 facing the magnetic cylinder 1 is defined as the inner wall, and the side wall facing away from the magnetic cylinder 1 is defined as the outer wall. The open-position magnetic plate 3 has a flat plate body B. A stop ring platform B31, which is a circular ring, is integrally disposed on the inner wall of the plate body B30. Similarly, the side wall of the plate body B30 facing the magnetic cylinder 1 is the inner wall, and the side wall facing away from the magnetic cylinder 1 is the outer wall. The plate body A20 and the plate body B30 are respectively fixedly connected to the two axial ends of the cylinder body 100. The stop ring platform A21 and the stop ring platform B31 extend into the cylinder body 100 and are arranged on the same central axis as the cylinder body 100. In addition, the inner and outer diameters of the stop ring platform A21 and the stop ring platform B31 are equal.

[0040] See attached Figure 3 Appendix Figure 6 and attached Figure 7As shown, the closing coil winding 4 has a frame A and a copper enameled coil wound on the frame A. The closing coil winding 4 is located between the first side of the mounting ring platform 101 facing the closing position magnetic guide plate 2 and the inner wall of the plate body A20. The outer wall of the stop ring platform A21 also stops and limits the closing coil winding 4. The opening coil winding 5 has a frame B and a copper enameled coil wound on the frame B. The opening coil winding 5 is located between the second side of the mounting ring platform 101 facing the opening position magnetic guide plate 3 and the inner wall of the plate body B30. The outer wall of the stop ring platform B31 also stops and limits the opening coil winding 5.

[0041] More preferably, both the frame A and the frame B adopt an I-beam structure, and the stop ring platform A21 and the stop ring platform B31 extend into the central inner hole of the frame A and the frame B respectively, so as to stop and limit the closing coil winding 4 and the opening coil winding 5 accordingly.

[0042] See attached Figure 3 Appendix Figure 6 To be continued Figure 8 As shown, there are several permanent magnets 6, each of which is a tile-shaped structure made of neodymium iron boron material and is fixedly arranged in a ring at equal intervals on the inner wall of the mounting ring platform 101 facing away from the cylindrical body 100; the magnetic guide ring 7 is a circular structure made of electrical pure iron, and the magnetic guide ring 7 is fixedly connected to the inner wall of the several permanent magnets 6 facing away from the mounting ring platform 101, and the inner wall of the magnetic guide ring 7 is flush with the inner wall of the central inner hole of the skeleton A and the inner wall of the central inner hole of the skeleton B, respectively.

[0043] See attached Figure 3 Appendix Figure 6 and attached Figure 8 As shown, the moving iron core 8 is a cylindrical structure made of electrical pure iron, with a mounting hole B extending axially from its center and penetrating both sides of its axial direction. The operating rod 9 is securely inserted into the mounting hole B. If the end of the mounting hole B facing the closed-position magnetic guide plate 2 is referred to as the first end, the mounting hole A80 is formed by radially expanding the first end of the mounting hole B. Furthermore, the second side of the moving iron core 8 facing the open-position magnetic guide plate 3 is a plane. When the bistable permanent magnet mechanism is in the open position, the second side of the moving iron core 8 can fit against the stop ring platform B31.

[0044] In addition, both the plate body A20 and the plate body B30 are provided with through holes of the same size as the inner diameter of the stop ring platform A21, so that the operating rod 9 can move through.

[0045] In summary, the bistable permanent magnet mechanism described in this invention has an automatic compensation function, which can ensure that the overall operating characteristic curve of the vacuum circuit breaker remains basically unchanged throughout its entire lifespan, making the overall characteristics of the vacuum circuit breaker stable and reliable. Moreover, the core improved structure of the bistable permanent magnet mechanism described in this invention is simple, compact, low-cost, and easy to manufacture and implement.

[0046] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics, comprising a magnetic cylinder (1), a magnetic plate for the closed position (2), a magnetic plate for the open position (3), a closing coil winding (4), an open coil winding (5), a permanent magnet (6), a magnetic ring (7), a moving iron core (8), and an operating lever (9), wherein, The magnetic cylinder (1) is a hollow cylindrical structure. The closing magnetic plate (2) and the opening magnetic plate (3) are respectively fixedly connected to the two ends of the magnetic cylinder (1) along the axial direction. The closing coil winding (4), the permanent magnet (6), and the opening coil winding (5) are arranged sequentially in the magnetic cylinder (1) along the axial direction. At the same time, the closing coil winding (4) is also close to the closing magnetic plate (2), and the opening coil winding (5) is... Group (5) is also close to the open position magnetic guide plate (3). The magnetic guide ring (7) is fixed on the inner side of the permanent magnet (6). The magnetic guide ring (7), together with the closing coil winding (4), the opening coil winding (5), the closing position magnetic guide plate (2), and the opening position magnetic guide plate (3), form a movable cavity. The moving iron core (8) is movably built into the movable cavity. The operating rod (9) is securely inserted into the moving iron core (8). Meanwhile, the two ends of the operating lever (9) are respectively movably extended outside the closed position magnetic guide plate (2) and the open position magnetic guide plate (3); the characteristic is that when the bistable permanent magnet mechanism is in the closed position, the first side of the moving iron core (8) facing the closed position magnetic guide plate (2) and the closed position magnetic guide plate (2) form a stroke compensation air gap that can compensate for the burn-out degree of the vacuum circuit breaker contacts, and a mounting hole A (80) is recessed on the first side of the moving iron core (8), one end of the compensation spring (10) is fixed in the mounting hole A (80), and the other end of the compensation spring (10) is a free end and can elastically abut against the inner wall of the closed position magnetic guide plate (2) under the drive of the moving iron core (8); that is, the compensation spring (10) can deform with the change of the stroke compensation air gap to counteract the change of permanent magnet attraction force generated by the change of the stroke compensation air gap of the permanent magnet (6).

2. The bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics according to claim 1, characterized in that: The travel compensation air gap is inversely proportional to the degree of contact burn-out of the vacuum circuit breaker.

3. The bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics according to claim 1, characterized in that: The moving iron core (8) is a cylindrical structure made of electrical pure iron. The mounting hole A (80) is formed on the first axial side of the moving iron core (8) facing the closed position magnetic guide plate (2) and is arranged coaxially with the moving iron core (8). One end of the compensation spring (10) is fixed in the mounting hole A (80), and the compensation spring (10) is also sleeved on the outside of the operating rod (9).

4. The bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics according to claim 1, characterized in that: The magnetic cylinder (1) has a hollow cylindrical body (100) and an integral mounting ring (101) protruding from the inner wall of the cylindrical body (100). The mounting ring (101) and the cylindrical body (100) are arranged on the same central axis. The closing position magnetic plate (2) has a plate body A (20) in the shape of a flat plate and a stop ring platform A (21) in the shape of a ring and integrally disposed on the inner wall of the plate body A (20). The gate position magnetic guide plate (3) has a plate body B (30) in the shape of a flat plate and a stop ring platform B (31) in the shape of a ring and integrally disposed on the inner wall of the plate body B (30). The plate body A (20) and the plate body B (30) are respectively fixedly connected to the two ends of the cylinder body (100). The stop ring platform A (21) and the stop ring platform B (31) extend into the cylinder body (100) and are arranged on the same central axis as the cylinder body (100). In addition, the inner and outer diameters of the stop ring platform A (21) and the stop ring platform B (31) are equal.

5. The bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics according to claim 4, characterized in that: The closing coil winding (4) has a skeleton A and a copper enameled coil wound on the skeleton A. The closing coil winding (4) is located between the first side of the mounting ring platform (101) facing the closing position magnetic guide plate (2) and the inner wall of the plate body A (20). The outer wall of the stop ring platform A (21) also stops and limits the closing coil winding (4). The trip coil winding (5) has a skeleton B and a copper enameled coil wound on the skeleton B. The trip coil winding (5) is located between the second side of the mounting ring platform (101) facing the trip position magnetic plate (3) and the inner wall of the plate body B (30). The outer wall of the stop ring platform B (31) also stops and limits the trip coil winding (5). The permanent magnets (6) are a plurality of each other, and the plurality of permanent magnets (6) are fixedly arranged in a ring at equal intervals on the inner wall of the mounting ring platform (101) facing away from the cylinder body (100); the magnetic ring (7) is fixedly connected to the plurality of permanent magnets (6) on the inner wall facing away from the mounting ring platform (101).

6. The bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics according to claim 5, characterized in that: Both the skeleton A and the skeleton B adopt the I-beam wheel structure, and the stop ring platform A (21) and the stop ring platform B (31) respectively extend into the central inner hole of the skeleton A and the skeleton B; In addition, the inner walls of the central inner holes of the skeleton A and the skeleton B are respectively flush with the inner wall of the magnetic ring (7).

7. The bistable permanent magnet mechanism with automatic compensation function for stroke and mechanical characteristics according to claim 4, characterized in that: The moving iron core (8) is a cylindrical structure made of electrical pure iron, with a mounting hole B in the center that extends along its axial direction and passes through both sides of its axial direction. The operating rod (9) is securely inserted into the mounting hole B. In addition, both the plate body A (20) and the plate body B (30) are provided with through holes of the same size as the inner diameter of the stop ring platform A (21) so that the operating rod (9) can move through.

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